package Lab01;

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World!");
        int a = 1;
        a = a + 1;
        a = a + 2;
        System.out.println("a is " + a);
        a = a + 3;  //断点行
        a = a + 4;
        System.out.println("a is " + a);
    }
}